US5550544C1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal converter noise shaper ad converter and da converter
Assignee: Panasonic Holdings Corp
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Filing: 1994-02-23
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Granted: 2002-02-12
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Expires: 2014-02-23
Abstract
Abstract The present invention provides a first-order delta-sigma AD converter adapted to conduct noise shaping and having a quantizer arranged such that, when the amplitude of an input signal entered into the quantizer is small, the amplitude of a difference signal between the input signal entered into the quantizer and an output signal therefrom, is small. It is therefore possible to achieve an efficient AD- or DA-converter reduced in power consumption, which satisfies the transmission characteristics of the specifications of CCITT G.714 based on a method of PCM-encoding an audio frequency band signal stipulated in the specifications of CCITT G.711.
Inventors
- 👤 Shiro Sakiyama
- 👤 Shiro Dosho
- 👤 Masakatsu Maruyama
- 👤 Hiroyuki Nakahira
- 👤 Toshiyuki Shono
- 👤 Akira Matsuzawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:06
CPC Classifications
H; H03; H03M; H03M3/00; H03M3/30; H03M3/39; H03M3/412; H03M3/422; H03M3/424; H03M3/436; H03M3/456
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-02-11 | 2005-08-13 | 2006-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-02-11 | 2009-08-13 | 2010-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-02-11 | 2013-08-13 | 2014-02-12 | $7700.00 | Window Closed / Lapsed |